Possible synergistic effect against the desert locust of a mixture of decis with water extracts of Mucuna pruriens (Fabacae)

A series of concentrations of Decis (3.125, 1.56, 0.78, 0.39 and 0.195 g/l) were tested in the lab on the Desert Locust, Schistocerca gregaria, alone and with a fixed concentration (25g/l) of water extracts of roots of Mucuna pruriens. A set of ten 2nd instar nymphs were treated with each respective concentration using hand sprayer (400 ml). Nymphs sprayed only with water served as control. The treatments were replicated 4-8 times. Knockdown effect was recorded one hour after treatment, while mortality was recorded on hourly basis for the first six hours after treatment and then on Subsequent days until complete mortality or transformation into 3rd instars. At the end, the total mortality was calculated for each treatment. Data was analyzed using Mstat-c statistical package applying one way variance analysis. Results revealed significant differences between treatments with Decis, Mucuna and Mucuna/Decis when compared with the untreated control. There were also significant differences between treatments with Mucuna/Decis mixtures and Decis alone. Results show a dramatic increase in the effect of Decis when mixed with Mucuna water extracts (both knockdown and mortality were enhanced). The resulting effect of the two toxic components exceeded the total sum of the effect of the two components used separately, indicating a possible synergistic effect. Thus a low dose of Decis may cause pronounced kill of locust when mixed with an extract of Mucuna. This is beneficial to the environment especially since at such low doses of Decis a less harmful effect would be expected to occur. (Texte intégral)

Bibliographic Details

Main Authors:	Abdalla, Mohamed Abdalla, Lecoq, Michel, Luong-Skovmand, My-Hanh, El Bashir, S.
Format:	conference_item biblioteca
Language:	eng
Published:	Arab Society for Plant Protection
Subjects:	H10 - Ravageurs des plantes, Mucuna pruriens, lutte anti-insecte, Acrididae, insecticide d'origine végétale, Schistocerca gregaria, http://aims.fao.org/aos/agrovoc/c_4971, http://aims.fao.org/aos/agrovoc/c_3885, http://aims.fao.org/aos/agrovoc/c_4416, http://aims.fao.org/aos/agrovoc/c_1021, http://aims.fao.org/aos/agrovoc/c_31931,
Online Access:	http://agritrop.cirad.fr/516372/
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